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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        //99乘法表

        // for (var a = 1; a <= 9; a++) {

        //     for (var b = 1; b < a; b++) {
        //         document.write(b + "*" + a + "=" + (a * b) + "  ");
        //     }
        //     document.write(a + "*" + a + "=" + (a * a) + "</br>")
        // }
        var a = 9;
        //math.sqrt可以对一个数进行开方
        var b = Math.sqrt(a);
        console.log(b)
    </script>
</body>

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